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Introduction to Cells

Introduction to Cells. Investigating Cells. Magnification Cells can be seen more clearly using Microscopes _________________________ the cells Microscopes may have two or three__________________________________________ and one ___________________________________________. microscopes.

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Introduction to Cells

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  1. Introduction to Cells Investigating Cells www.assignmentpoint.com

  2. Magnification Cells can be seen more clearly using Microscopes _________________________ the cells Microscopes may have two or three__________________________________________ and one ___________________________________________. microscopes magnify objective lenses eyepiece lens www.assignmentpoint.com

  3. Calculating Magnification To work out Total Magnification use the following formula TOTAL=x MAGNIFICATION magnification of eyepiece lens magnification of objective lens www.assignmentpoint.com

  4. Since microscopes magnify cells we have a new unit of measurement. These new units are called _________________________. 1mm = 1000 µm 1 = 1 µm 1000 microns www.assignmentpoint.com

  5. Measuring Cell Size We can use microscopes to estimate the size of cells we are looking at e.g. if we know the diameter of the field of our field of view we can then estimate the size of the cells www.assignmentpoint.com

  6. if the field of view = 1mm • then onion cells are • ______________ mm • or ______________(µm) in length Field of view Onion cell 1mm (1000 µm) 0.5 500 microns www.assignmentpoint.com

  7. if the field of view = 0.5mm or 500µm • then these cheek cells would be • mm or ______________ µm in length 500 5 100 0.5 mm (500 µm) Human cheek cell www.assignmentpoint.com

  8. 4000 1000 500 www.assignmentpoint.com

  9. Staining Cells Animal and plant cells can be _________________________ so that the ____________________________________ can be______________________________ stained structures within cells seen more clearly www.assignmentpoint.com

  10. _________________________ stains the • _________________________ of onion • cells and also its • _________________________. Iodine nucleus cell wall www.assignmentpoint.com

  11. Methyl Blue _________________________ is used to stain the _________________________ of __________________________. nucleus human cheek cells www.assignmentpoint.com

  12. Acetic orcein _________________________ is used to stain the _________________________ present in the nucleus of cells which are about to divide. chromosomes www.assignmentpoint.com

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